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issp-center-dev / HPhi

Quantum Lattice Model Simulator Package
https://www.pasums.issp.u-tokyo.ac.jp/hphi/en/
GNU General Public License v3.0
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Question regarding parameters. #84

Closed georgeyumnam closed 4 years ago

georgeyumnam commented 4 years ago

Hi, I would like to know if there is a height parameter that can be provided. In the case of length and width, there exists the following: Llength, and Wlength. Is there a similar parameter for height?

I am also wondering if there is a way to compute the J'/J parameters (rather than using them as inputs), for a certain set of lattice geometry within the Heisenberg model?

Thank you very much.

tmisawa commented 4 years ago

@georgeyumnam Hi.

For the first question, height parameter is specified by the keyword "Height". For more details, please see the manual (around page 125).

http://issp-center-dev.github.io/HPhi/manual/master/userguide_HPhi_en.pdf

For the second question, what quantities do you want to calculate J'/J from ? J' and J can be separately specified in standard mode. So, I think it is straightforward to calculate its ratio J'/J from the input files.

georgeyumnam commented 4 years ago

Thank you for your reply. I have seen this parameter "Height" before, but I think this takes integer values and acts like a supercell dimensions like L, W. But I am looking for a parameter like Llength, Wlength in the case of the height.

Regarding the second question, I am looking for a way to obtain the J2,J1 parameters as a result of an eigen value problem by giving the height parameter. Something similar to this MC simulation (G. Möller and R. Moessner, Phys. Rev. Lett. 96, 237202 (2006)). I am thinking of a simpler case, and I don't need to define the dipolar interaction, as I am only interested in the J1-J2 model. My goal is to obtain a similar plot like Fig.1b, but my plot would be a 2d plot: J2/J1 vs height.

Thank you very much.

tmisawa commented 4 years ago

In the case of the height, you can use Hlength.

For the second question, I would like to remind you that Hphi only solves the eigenvalue problems for the given Hamiltonians. So, please specify the Hamiltonian or the matrix that you want to consider. In other words, please specify "an eigen value problem by giving the height parameter".

georgeyumnam commented 4 years ago

Thank you once again for your reply.